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Total Head, Velocity Head, Pressure Head, Datum or Potential Head, Assumptions Made for Deriving Bernoulli’s Equation

5.3 TOTAL HEAD

Each term of the Bernoulli’s equation represent the dimension of length i.e., in 5.1. it is meter. Left hand side i.e.,(p / p g + v2 / 2 g + z) is called the total head.

 

5.4 VELOCITY HEAD

In equation (5.3), v is the velocity and ( v2 / 2 g) is called the velocity head.

 

5.5 PRESSURE HEAD

In equation (5.3), p is the pressure and (:g ) is called the pressure head.

 

5.6 DATUM OR POTENTIAL HEAD

In equation (5.3), z is called the datum head or potential head.

Note : All the head is nothing but energy per unit weight.

 

5.7 ASSUMPTIONS MADE FOR DERIVING BERNOULLI’S EQUATION

Following are some Assumptions made for deriving Bernoulli’s equation:

(i) The flow is incompressible.

(ii) The flow is steady.

(iii) The fluid is non viscous (ยต. = 0)

(iv) The flow is irrotational.